There is no single answer to this just as there is no single plus-size petite configuration. I, for example have a normal length torso and very short legs. If you want a general answer I'd go for slacks as long as they fit well. A business suit is typically neutral in color. Dark neutrals will look great as slacks but they have to fit well and go with the major item of business wear, your jacket. Wearing slacks with a matching jacket will give a one color silhouette which will make you look taller than you would in a skirt where you are 'broken up' into shoes, tights, skirt, jacket. However, beware the color. I once bought a 'neutral' that was a sort of burnt orange, and when draped on my 60 inch bust that turned out to be rather intimidating! Stick to the best neutrals, navy, deep teal, moss/olive green, dark brown, deep gray and of course our old friend, black.